allan catt wrote:
Had the same problem on my 2010 Mazda,cost me £96 to have light put out but could not find problem,2days later light was on again,reset for free,4days later on again,garage done another check and found that the Eloys tank had a leak and was low on fluid.( Eloys is a fluid that mixes with Deisel to reduce emission ) had to have tank replaced at a cost of £500 ,the 4 litres of fluid cost £160 .but should last for about 60.000 miles,if it doesn't leak again.
Newer diesels in the US require the urea also. But it is much less expensive: $3/gallon I think. They have pumps for it at the truck stops. They call it DEF here.